真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)，這一術(shu)語譯(yi)自拉丁文(wen)vacuo，其意義是(shi)(shi)虛無(wu)。其實(shi)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)應理解(jie)為(wei)氣(qi)體(ti)較稀薄的空(kong)(kong)(kong)(kong)間。在指定的空(kong)(kong)(kong)(kong)間內(nei)，低于一個大氣(qi)壓力的氣(qi)體(ti)狀態統稱(cheng)為(wei)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)。真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)狀態下氣(qi)體(ti)稀薄程度(du)稱(cheng)為(wei)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)度(du)（degreeofvacuum），通常用壓力值(zhi)表示。因此(ci)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)包(bao)裝(zhuang)(zhuang)實(shi)際上不是(shi)(shi)完(wan)全真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)的，采用真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)包(bao)裝(zhuang)(zhuang)技術(shu)包(bao)裝(zhuang)(zhuang)的食品容器內(nei)的真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)度(du)通常在600-1333Pa。所以(yi)，又將真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)包(bao)裝(zhuang)(zhuang)稱(cheng)為(wei)減壓包(bao)裝(zhuang)(zhuang)或排氣(qi)包(bao)裝(zhuang)(zhuang)。